Well i use some mods that i think are compatible with First Aid, But everytime i go to survivial, the game glitches out and doesnt give me the heart gui. Please tell me what to do or something

This is intentional, first aid disables the hearts HUD, as they no longer respresent the actual life, and first aid has another hud to display per-limb health. You can however reenable the hearts in the First aid config under the "Overlay" Section

have you change the config of First Aid that it show up?

And do you have mods that might dose some UI/HUD changes, if so then what mod?